Why cant i sit in the car when its cloned?

I made a button, that clones your car in front of you. But if i clone it in studio, it works but in game i cant sit in it. whats the problem?

script:

local debounce = false
local plr = game.Players.LocalPlayer
script.Parent.MouseButton1Click:Connect(function()
       if not debounce then
    for i,v in pairs(game.Players.LocalPlayer.Character:GetChildren()) do
        if v:IsA("Model") then
        v:Destroy()
        end
    end
    wait(0.1)
         local car = plr.SelectedCar.Value:Clone()
        car.Parent = game.Players.LocalPlayer.Character
        car.Name = plr.Name..("'s Car")
        car:SetPrimaryPartCFrame(plr.Character.Head.CFrame * CFrame.new(0,0,-10))
        car:MakeJoints()
        debounce = true
        wait(1)
        debounce = false
    end
end)